6J5_China

Hello radiofriends,

recently I have bought a tube preamplifier that uses two 6J5 tube ( chinese version with 7 pins ).

Please have someone the pin configuration for this tube? many thanks in advance.

Hello Giuseppe,

please show some good detailed pictures of the 7-pin Chinese 6J5 here in the forum and upload them also to the tube page. Maybe the pin-out can be determined by examination the pics.

Furthermore, the preamplifier should be added as a new model suggestion.

Until now, the only model in RMorg using this tube, is a Chinese console Peony 牡丹 1201. Real pictures are stil missing there.

According to the schematic, the Chinese 6J5 is a kind of beam power tube. It's not a triode, in contrast to all other 6J5 variants.

Thanks for your assistance in this matter.

Best regards
Bernhard

Hello Bernhard,

thanks for your reply, till now I have found the pins 3 and 4 are the heater filament, and think the pins are the same of the chinese 6J1 pentode, but obviously I'm not sure!

The heater current is about 430mA @ 6,3Vcc

this preamp is a kit, not a complete model.....

I have attached a photo of this tube

best regards...

G.

Attachments

• IMG_20201116_150553 (66 KB)

Hello,

the 6J5_China is obviously the Chinese version of the Russian 6Ж5П, which in turn is the Russian version of the 6AH6.

It uses a beam structure, but it's no power output tube, - which wouldn't make sense in a preamplifier.

Best Regards,
Jacob

Thanks  Jacob for your notes ! 

so the pin assignment are like the russian version  .....in my preamp, this tube is used as a triode with a connection between pin 5 and 6.

However the chinese schematic uses it as a power output tube in the AF final stage.....

now I know all the pins functions....thanks again.

best regards.

G.

The datasheet of the equivalent 6AH6 tells about a maximum plate dissipation of 3.2 W, a nominal operating plate current of 10 mA at 300 V, which may be sufficient for a modest output power, but there is nothing told about this use.

B R, Jacob

Thanks Jacob,

the the pin assignment picture in the 6J5_China page is not the right one, in reality there is not an internal connection between pin 2 and pin 7.....I have uploaded a new pin assignment picture.

B R.....

G.

Attachments

• 6J5_china pin assignment (8 KB)

Unfortunately a wrong base diagram was shown at the original 6AH6 page, which I've copied unaware to the 6J5_China page. Now I've replaced it by the correct one everywhere.

BR Jacob

THANKS !!! Now the tube page is OK !